Femtosecond electron pulse compression by using the time focusing technique in ultrafast electron diffraction

doi:10.1088/1674-1056/20/11/114102

Abstract We present a new model of an electron gun for generating subrelativistic femtosecond (fs) electron pulses. The basic idea is to utilize a dc acceleration stage combined with a time focusing region, the time focusing electrode generates an electron energy chirp for bunching at the target. Without considering the space charge effects, simulations of the electron gun were carried out under the conditions of different dc voltages and various slopes of the voltage added on the time focusing electrode. Tracing and simulating large numbers of photoelectrons through Monte-Carlo and finite difference methods, the electron pulses with 1 ps can be compressed to 55 fs, which will allow significant advances in the field of ultrafast diagnosis.

Keywords: time focusing technique temporal pulse compressing time-dependent electric field Monte-Carlo method

Received: 27 February 2011
Revised: 16 June 2011
Accepted manuscript online:

PACS:	41.75.Fr	(Electron and positron beams)
	07.77.Ka	(Charged-particle beam sources and detectors)
	41.90.+e	(Other topics in electromagnetism; electron and ion optics)
	41.85.Ne	(Electrostatic lenses, septa)

Fund: Project supported the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 60901036), the Innovation Laboratory Fund of the Chinese Academy of Sciences (Grant No. CXJJ-10-S13), and the National Natural Science Foundation of China (Grant No. 60777027).

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Wen Wen-Long(温文龙), Lei Xiao-Hong(雷晓红), Hu Xin(胡昕), Xu Xiang-Yan(徐向晏), Wang Jun-Feng(王俊锋), Cao Xi-Bin(曹希斌), Liu Hu-Lin(刘虎林), Wang Chao(王超), Dang Li-Hong(党利宏), and Tian Jin-Shou(田进寿) Femtosecond electron pulse compression by using the time focusing technique in ultrafast electron diffraction 2011 Chin. Phys. B 20 114102

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Femtosecond electron pulse compression by using the time focusing technique in ultrafast electron diffraction

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